Portable holding device



FIG. 1 is a top perspective view of a portable holding device showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is an alternate side view thereof;

FIG. 4 is a further alternate side view thereof;

FIG. 5 is a plan view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a portable holding device, as shown and described. 